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Low-carbon low-phosphorus low-aluminum high-nitrogen ultralow-sulfur steel and preparation method thereof

An ultra-low-sulfur steel and ultra-low-sulfur technology, applied in the field of metallurgy, can solve the problem of difficulty in stabilizing the content of steel grades, and achieve the effects of improving the cleanliness of molten steel, compact and firm structure, and increased efficiency.

Active Publication Date: 2022-04-22
SHOUGANG JINGTANG IRON & STEEL CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] This application provides a low-carbon, low-phosphorus, low-aluminum, high-nitrogen, ultra-low-sulfur steel and its preparation method, in order to solve the difficulty in the content of various components of the steel in the prior art stable technical issues

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  • Low-carbon low-phosphorus low-aluminum high-nitrogen ultralow-sulfur steel and preparation method thereof
  • Low-carbon low-phosphorus low-aluminum high-nitrogen ultralow-sulfur steel and preparation method thereof
  • Low-carbon low-phosphorus low-aluminum high-nitrogen ultralow-sulfur steel and preparation method thereof

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[0033] In order to make the purposes, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments It is a part of the embodiments of this application, but not all of them. Based on the embodiments in the present application, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present application.

[0034] In one embodiment of the present application, there is provided a low-carbon, low-phosphorus, low-aluminum, high-nitrogen, ultra-low-sulfur steel, comprising: C: 0.03-0.05%, Si: 0.18-0.22%, Mn: 1.3-1.4 %, P: 0-0.009%, S: 0-0.002%, Alt: 0-0.01%, N: 0.008-0.013%, Ni: 0.13-0.17%, V: 0.09-0.11%, the rest is Fe and unavoidable of imp...

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Abstract

The invention relates to the technical field of metallurgy, in particular to low-carbon, low-phosphorus, low-aluminum, high-nitrogen and ultralow-sulfur steel and a preparation method thereof.The low-carbon, low-phosphorus, low-aluminum, high-nitrogen and ultralow-sulfur steel comprises C, Si, Mn, P, S, Alt, N, Ni, V and the balance Fe and inevitable impurities; the method comprises the steps that molten iron of the low-carbon, low-phosphorus, low-aluminum, high-nitrogen and ultralow-sulfur steel is obtained; the molten steel is sequentially subjected to KR desulfurization, converter smelting and LF furnace refining, and molten steel is obtained; the molten steel is subjected to continuous casting and rolling, and a steel coil is obtained; by controlling the chemical components of the low-carbon, low-phosphorus, low-aluminum, high-nitrogen and ultralow-sulfur steel, the stability of the components in the steel grade is realized, and the toughness and plasticity of the steel are improved; and by controlling the processes of KR desulfurization, converter smelting and LF furnace refining, the cleanliness of the molten steel is improved, and the stability of the content of each component is maintained.

Description

technical field [0001] The application relates to the technical field of metallurgy, in particular to a low-carbon, low-phosphorus, low-aluminum, high-nitrogen, ultra-low-sulfur steel and a preparation method thereof. Background technique [0002] Steel structure has significant advantages such as high strength, light weight, good seismic performance, high degree of factory production, short construction period, low consumption and recyclable utilization. Since the mechanical strength of steel is a function of temperature, when the temperature is higher than 600 ° C , the steel basically loses its bearing capacity. [0003] At present, the low-carbon, low-phosphorus, low-aluminum, high-nitrogen, and ultra-low-sulfur steel design is adopted to realize that the steel’s bearing capacity will not be lost under the condition of 600°C. However, the use of low-carbon, low-phosphorus, low-aluminum, high-nitrogen, and ultra-low-sulfur steel has the following disadvantages : [0004...

Claims

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Application Information

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IPC IPC(8): C22C38/02C22C38/04C22C38/06C22C38/08C22C38/12C21C1/02C21C5/34C21C7/00C21C7/064C22C33/06
CPCC22C38/02C22C38/04C22C38/06C22C38/001C22C38/08C22C38/12C21C5/34C21C7/064C21C1/02C21C7/0006C22C33/06Y02P10/20
Inventor 李阳杨荣光胡显堂石树东张虎成谢翠红王国连
Owner SHOUGANG JINGTANG IRON & STEEL CO LTD
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